Oximeter Finger Fingertip Portable Blood Oxygen Saturation Pulse Heart Rate Monitor Item Type: Oximeter Product Material: ABS Display Type: TFT Display SpO2 Measuring Range: 70%-99% SpO2 Accuracy: ±2% in the 80%~99% stage, ±3% in the 70%~79% stage; ±1% in less than 70%, not required. PR: Measuring range: 25 BPM to 250BPM, accuracy: ±1BPM or +1% (the larger one) Power Supply: Two AAA 1.5V Alkaline Batteries (delivered without batteries) Power Consumption: Below 30mA Automatic Power Off: The product will automatically turn off the power when no finger is placed on the product within 28 seconds. Working Environment: Temperature: 5℃~40℃, humidity: 15%~80%, atmospheric pressure: 70kPa -106kPa. Transportation and Storage Environment: Temperature: -10℃-55℃, humidity: s95%, atmospheric pressure: 50kPa~106kPa. Note: In no corrosive gas and well-ventilated environment.